A technical question that I guess isn't really important for anyone here but just wondering...
From what I'm reading of info found on the internet; injector placement closer to the valve is good for emissions and idle quality, and further away promotes better atomization. So port injection production cars have them close to the valve, and F1 has them outside of the itb pointing in the direction of flow...
My question is regarding the injector further away from the valve:
With any efi engine at top rpm the injector is close to being always open. So having the injector spraying into a mostly stale tract would just be pooling the fuel until the valve opens and sucks it all in, thus negating most advantages of this atomization and furthering wall wetting???
In that case wouldn't having the injector at the valve eg like our Kjet heads be the best placement? The added benefit would be atomizing the fuel on the hot valve...
And side question, would the only reason Volvo went to the injector boss in manifold setup have been cost related? Because not only is the injector further away from the valve but now there is this obtrusion in the manifold.